diff --git a/src/panfrost/bifrost/bifrost_compile.c b/src/panfrost/bifrost/bifrost_compile.c
index 55a17f3bf35..22a196c2fe6 100644
--- a/src/panfrost/bifrost/bifrost_compile.c
+++ b/src/panfrost/bifrost/bifrost_compile.c
@@ -740,7 +740,7 @@ bi_alu_src_index(nir_alu_src src, unsigned comps)
         assert(idx.swizzle == BI_SWIZZLE_H01);
 
         /* Bigger vectors should have been lowered */
-        assert(comps <= (1 << bitsize));
+        assert(comps <= (1 << subword_shift));
 
         if (bitsize == 16) {
                 unsigned c0 = src.swizzle[0] & 1;